no description, except to give its dimensions, since in all other respects it is precisely similar to the House of the Moon. The House of the Sun, according to the measurement of Sr. Garcia y Cubas, which is the most recent, is at the base 232 metres or 761 feet by 220 metres or 722 feet. Its height is 66 metres or 216 feet, while the summit platform measures 18 by 32 metres or 59 by 105 feet. Both this pyramid and the preceding have each a small mound on one of their sides near their base. In the latter instance this mound seems connected with an avenue of mounds just west of it. An embankment marked _a_, _b_, _c_, _d_, one hundred and thirty feet wide on the summit and twenty feet high, widening out at the extremities into platforms, extends around three sides of the “House of the Sun.” Across the Rio San Juan, and at the distance of twelve hundred and fifty yards southward of the “House of the Sun,” stands the Texcalpa or “citadel.” This is a quadrangular enclosure, measuring on its exterior twelve hundred and forty-six by thirteen hundred and thirty-eight feet. The embankments are of enormous strength, being two hundred and sixty-two feet thick by thirty-three feet high, except on the western side, which is but sixteen feet high. The enclosure is divided unequally by a wall as strong as that upon the sides. On the centre of this wall stands a pyramid ninety-two feet high. At its base are two small mounds besides one in the western enclosure, while fourteen others averaging twenty feet in height are arranged with regularity upon the summit of the enclosing wall. An avenue two hundred and fifty feet wide formed by mounds and measuring two hundred and fifty rods in length, extends from a point south of the “House of the Moon” to the river, as is shown from C to D, in the plan. The avenue is cut up into compartments by six cross embankments, a rather strange feature for which no explanation has been afforded. These mounds are mostly conical, built of fragments of stone and clay, and some of them reach a height of thirty feet. The native traditions call it Micaotli, which may indicate that they were designed for the purposes of sepulture. Almaraz, who excavated one of the multitude of mounds or _tlalteles_ in the vicinity, found four walls meeting at right angles, though a little inclined and forming a small square. Connected with this were steps, at the top of which four other walls enclosed a little room, supposed to have been a tomb. The natives describe the discovery of a stone box in one of the mounds containing a skull, with about such a collection of trinkets as is commonly met with in the stone graves of Tennessee. Mayer describes a massive stone column, ten feet long and four feet square, cut from a single block. This resembles the elaborate capitol of a column resting on a base with scarcely a shaft intervening. It is called the fainting stone by the natives, who believe that whoever sits on it is sure to faint instantly.